<template>
  <div>
     <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>   
    </el-breadcrumb>
    <el-card>
        <el-alert title="注意：只允许更改第三级的相关属性" type="warning" :closable="false" show-icon></el-alert>
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <el-cascader v-model="selectedCateParams" :options="catParamsList" :props="cateProps" @change="handleChange"></el-cascader>
            </el-col>
        </el-row>
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 动态参数和静态属性都要绑定click事件 -->
            <el-tab-pane label="动态参数" name="many" >
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParamsDialogVisible=true">添加参数</el-button>
                <el-table :data="manyTableData" border stripe>
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                            <!-- 输入文本框 -->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope"> 
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete"  size="mini" @click="removeParams(scope.row.attr_id)"> 删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParamsDialogVisible=true">添加属性</el-button>
                <el-table :data="onlyTableData" border stripe>
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete"  size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>
    <el-dialog :title=" '添加' + titleText " :visible.sync="addParamsDialogVisible" width="50%" @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRuleForm">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addParamsDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>
    <el-dialog :title=" '修改' + titleText " :visible.sync="editParamsDialogVisible" width="50%" @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRuleForm">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editParamsDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            catParamsList:[],
            cateProps:{
                expandTrigger: 'hover',
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            selectedCateParams:[],
            activeName:'many',
            manyTableData:[],
            onlyTableData:[],
            addParamsDialogVisible:false,
            addForm:{
                attr_name:''
            },
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            editForm:{
                attr_name:''
            },
            editParamsDialogVisible:false,
            editFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
        }
    },
    created() {
        this.getCatParams()
    },
    methods:{
        async getCatParams() {
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200) {
                return this.$message.error('获取参数商品列表失败')
            }
            this.catParamsList = res.data
        },
        handleChange() {
            this.getParamsData()

        },
        handleTabClick() {
            this.getParamsData()
        },
        // 获取参数列表
        async getParamsData() {
            // 没有选中第三项
            if(this.selectedCateParams.length !== 3) {
                this.selectedCateParams = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item => {
                // 将返回的数，变成数组，还要控制每一项的显示与隐藏，和input的数据输入
                item.attr_vals = item.attr_vals? item.attr_vals.split(','):[]
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                item.inputValue = ''
            })
            // 根据返回的数据，选择面板,储存对应的数据
            if(this.activeName === 'many') {
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        addDialogClosed() {
            this.$refs.addFormRuleForm.resetFields()
        },
        addParams() {
            this.$refs.addFormRuleForm.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addParamsDialogVisible = false
                this.getParamsData()
            })
        },
        async showEditDialog(attr_id) {
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            console.log(res.meta);
            if(res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败')
            }
            this.editForm = res.data
            this.editParamsDialogVisible = true
        },
        editDialogClosed() {
            this.$refs.editFormRuleForm.resetFields()
        },
        editParams() {
            this.$refs.editFormRuleForm.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数失败')
                this.getParamsData()
                this.editParamsDialogVisible = false

            })
        },
        async removeParams(attr_id) {
            const confirmResult =  await this.$confirm('此操作将永久删除该属性，是否继续？','提示',{
                confirmButtonText:'确定',
                cancelButtonText:'取消',
                type:'warning'
            }).catch(err=>err)
            if(confirmResult !== 'confirm') {
                return this.$message.info('用户已经取消了删除')
            }
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status !== 200) {
                return this.$message.error('删除参数失败')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)   
        },
        async saveAttrVals(row) {
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(',')})
            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        showInput(row) {
            row.inputVisible = true
            this.inputVisible = true;
            // $nextTick 当页面上元素被重新渲染之后，才会执行回调函数中的代码
            this.$nextTick(()=> {
                this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        handleClosed(index,row) {
             row.attr_vals.splice(index,1)
             this.saveAttrVals(row)
        }
    },
    computed:{
        isBtnDisabled() {
            if(this.selectedCateParams.length !== 3) {
                return true
            }
            return false
        },
        cateId() {
            if(this.selectedCateParams.length === 3) {
                return this.selectedCateParams[2]
            }else{
                return null
            }
        },
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>

<style>
.cat_opt {
    margin: 15px 0;
}
.el-tag{
    margin:10px
}
.input-new-tag{
    width: 120px !important;
}
</style>